卵石层钻进和预引孔直接静探实践
摘要:要获取卵石、漂石的物理力学性质指标,就必须查明卵石的密实度,颗粒大小、颗粒骨架分布、含量以及充填物的含量。而施工效率低,劳动强度大,成本高是卵石、漂石钻孔施工中的的主要问题。用动力触探判定卵石层的密度有一定的局限性,当打到卵石顶面时击数很高,打到卵石缝内击数又很低,动弹数据离散性大,必须和《建筑工程地质勘探与取样技术规程》(JGJ/T 87—2012)附录表G.0.6定性判定相结合,才能使确定的密实度更客观。静力触探往往无法直接穿越密实的砂层,获取其下部的细粒土静力触探指标也是个工程中经常遇到的问题。根据几个不同的场地岩土工程勘探实践对上述问题进行了有益探索。
Abstract:To get the physical and mechanical properties of cobble and boulder, you should first find out the compactness, grain size, distribution patterns, contents, and the fillings content. Now, lower construction efficiency, great labour intensity and high cost are the main problems in drilling. Meanwhile, there is a limitation that using dynamic sounding to judge the density of cobble, because it is much higher when drilling the surface of cobble, and lower when drilling the fracture of cobble. Considered with 《Technical specification for engineering geological prospecting and sampling of constructions》JGJ/T 87-2012 attached table G.0.6, the acquired compactness will be more objective. Static sounding generally cannot cross tight gravels, so how to get the static sounding data below them is a difficult problem in our work. Based on several different geotechnical engineering exploration practices, this paper discussed the solutions for the above mentioned problems.
中文标题：
卵石层钻进和预引孔直接静探实践
Analysis of Drilling in Cobble Layer and Direct Static Sounding in Pre-guide Hole
作者：
李建斌,赵君鹏,周春华
Li Jianbin,Zhao Junpeng,Zhou Chunhua
作者简介:李建斌,1965年生,男,汉族,河南洛阳人,高级工程师,注册岩土工程师,从事岩土工程勘察、设计、施工。E-mail:hn.dk@163.com
通讯地址：
河南省郑州地质工程勘察院, 河南郑州 450053
ZhengzhouInstituteofGeologicalEngineeringInvestigationofHenanProvince,Zhengzhou450053,Henan,China
中图分类号:P634.5
doi:10.3969/j.issn.1007-2993.2013.03.013
出版物：岩土工程技术
收稿日期:2013-03-11
关键词:冲抓锥,潜孔锤,孔内录像,直接静探
Key words:cone grab,dth hammer,video monitoring through the hole,direct static sounding
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